diff --git a/package/libwebsockets/Config.in b/package/libwebsockets/Config.in
index 1d927bb4e..2b350bf38 100644
--- a/package/libwebsockets/Config.in
+++ b/package/libwebsockets/Config.in
@@ -1,5 +1,6 @@
 config BR2_PACKAGE_LIBWEBSOCKETS
 	bool "libwebsockets"
+	depends on BR2_USE_MMU # fork()
 	select BR2_PACKAGE_ZLIB
 	help
 	  Libwebsockets is a lightweight pure C library built to use